What’s Vulnerable › Vulnerabilities
CVE-2026-114619: Authlib: OpenID implicit grant checks raw scope instead of allowed scope before issuing ID tokens
- Severity: medium (CVSS 4.6 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-10-22 · updated 2026-10-29
- Weakness: CWE-863
Description
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, OpenIDImplicitGrant.validate_authorization_request() checks the client-controlled raw request.payload.scope for openid after the parent grant has filtered allowed scopes into request.scope. A registered client permitted an ID token response type but not the openid scope can add openid to the request, obtain user consent, and receive a signed ID token containing the user's subject and allowed profile claims. Authorization code flow and deployments that allow openid for every client permitted an ID token response are not affected. In authlib/oidc/core/grants/implicit.py, OpenIDImplicitGrant.validate_authorization_request() checks request.payload.scope instead of the filtered request.scope. This issue is fixed in version 1.9.0.
Affected products
How to fix
Upgrade to a fixed version: authlib 1.9.0. Check the vendor advisory for mitigations.
References
- https://github.com/authlib/authlib/commit/e3bd41cb29dcfee434453b135ffb487884baeedf
- https://github.com/authlib/authlib/pull/945
- https://github.com/authlib/authlib/releases/tag/v1.9.0
- https://github.com/authlib/authlib/security/advisories/GHSA-q686-2qmg-hqc7
- https://github.com/authlib/authlib/security/advisories/GHSA-q686-2qmg-hqc7
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